🚀 go-pugleaf

In article <7204@ncoast.UUCP> crds@ncoast.UUCP (Glenn A. Emelko) writes:
<>Ok, all you "techno-hacks" -- I've got a good one for you.  I have a Charles
<>River Universe 68/35 running UNOS 5.1.1, it currently has one Quantum 40Mb
<>hard drive (35Mb -- sorry) and an 8 inch floppy, and I believe the 8 inch is
<>using standard IBM format (ie 77 track 128 byte/sector 26 sectors/track) with
<>the "cfd0" device driver.  What I want to do is this:  Use a 5.25 inch drive
<>instead, in ANY format that will work, I only need to be compatible with me.
<>(I have 2 crds's).  This is what I've found so far.
<>
<>I can unplug the 34-pin berg connector from the CC-1 controller, and put on my
<>own 34-pin berg to 34-pin edge-slot connector, and plug that into my 5.25" disk
<>and it DOES drive select, head step, and the whole bit.  In fact, I can attempt
<>a format using ANY of the standard UNOS5.1.1 drivers (cfs0, cfd0, cfssdd0, etc.)
<>and it works fine, except when I go to use the disk.  Now by fine, I mean that
<>it actually goes out there and accesses/writes a format onto the disk -- that 
<>is not to say that the disk is usable yet, however MOSTLY it is.  I also found
<>that if I use makedev, I can create a format that is even MORE compatible, but
<>still doesn't give me the full usage of a double sided disk.  I use the makedev
<>to create device 4,231 (rfl0 and fl0 unbuffered and buffered respectively), and
<>that driver in to os seems to only use 16 sectors/side of the disk, which is
<>at least readible.  However, fmtdisk is STILL trying to put 77 tracks on the
<>disk, which has the negative effect of ruining the format on the inner-most
<>track of the disk, making it unusable (as well as trying to step my drive past
<>the physical stops on it, which isn't real healthy for it).  What I would like
<>is this:  18 sectors/side (256 bytes/sector), double sided, 40 tracks, which
<>should give me about 360k on the drive.  I'd even settle for 320k if I had to.
<>
<>Ok, is that a challenge for you folks?  :->
<>Glenn A. Emelko
<>(crds@ncoast, aka ...!ihnp4!cbosgd!mandrill!hal!ncoast!crds in bad weather)
<
<
Boy that's a problem.  I have a solution that might make you happy.  Just
replace your 8-inch drive with the equivalent of a Shugart 475.  These
are 1.2 Mbyte drives the same as a double-density 8-inchers.  One small
hitch you must adapt the 50 pin header to the 34-pin header of the
5.25, for that you need the manual for the drive.  Everything else is
the same as an 8-incher.  Maybe you could get the connection data from
an AT Technical Reference.

Good Luck,

-- 
G. Roderick Singleton              |  "ALL animals are created equal,
   <gerry@syntron.uucp>,           |   BUT some animals are MORE equal
or <gerry@geac.uucp>,              |   than others." a warning from
or <gerry@eclectic.uucp>           |  "Animal Farm" by George Orwell